Homehouse

No, he does not own the house and he has no right to eject anyone. As your mother died intestate, someone will have to administer her estate. A surviving spouse ranks above a child in the order of grant of administration but your father might not want that.

Who actually inherits is set out in the Succession Act and IIRC, a surviving spouse is entitled to 50% where there are children and the children are entitled to the remaining 50%. Although not divorced, did your parents have a separation agreement (court sanctioned or otherwise). For example, did he pay maintenance under an agreement. If yes and there was a solicitor involved (as opposed to a man informal agreement between them) then it is likely that he would have been requested or forced to give up his succession rights in which case you and your siblings would inherit everything.

My parents had an acrimonious separation and inheritance rights were abandoned mutually. If you can find that out first, you may be in stronger grounds.

the homehouse was my mother's passed down from her grandad

bear in mind whose name the house is in.

Your mother may not in fact be the"legal" owner.

Hi,

This weblink might be of interest to you but my twopence worth is you & your siblings should get a solicitor quickly. As you maybe in a stronger position than you know and there could be other remedies open to you, if there was a history of violence from your dad to your Mum, you & your siblings.

https://www.citizensinformation.ie/en/death/the-deceaseds-estate/what-happens-the-deceaseds-estate/#222b52